Utility class to generate n-body event,
with constant cross-section (default)
or with Fermi energy dependence (opt="Fermi").
The event is generated in the center-of-mass frame,
but the decay products are finally boosted
using the betas of the original particle.
see example of use in $ROOTSYS/tutorials/PhaseSpace.C

Generate a random final state.
The function returns the weigth of the current event.
The TLorentzVector of each decay product can be get using GetDecay(n).
The maximum weigth can be get using GetWtMax().

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